GCSE Chemistry Formulae Higher 0.0 / 5 ? ChemistryChemical FormulaeGCSEOCR Created by: GSidhuCreated on: 25-12-18 10:45 Relative atomic mass = Σ(isotope abundance x isotope mass number) /100 1 of 14 Law of conservation of mass = Total mass of reactants = total mass of products 2 of 14 Moles = Mass/relative formula mass 3 of 14 Percentage yield = Real yield/theoretical yield x 100 4 of 14 Atom economy (%) = Relative molecular mass of desired products/total relative molecular mass of all reactants x 100 5 of 14 Overall energy change = Energy required to break bonds - energy released by forming bonds 6 of 14 Surface area to volume ratio = Surface area/volume 7 of 14 Rf value = Distance travelled by solute/distance travelled by solvent 8 of 14 Concentration (g/dm ³) = Mass of solute/volume of solution 9 of 14 Concentration (mol/dm³) = Number of moles/volume of solution 10 of 14 Molar volume = Gas volume/number of moles 11 of 14 Rate of reaction = Amount of reactant used or amount of product formed/time 12 of 14 Gradient = Change in y/change in x 13 of 14 Reversible reactions = A + B ⇌ C + D 14 of 14
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